Center of mass | Impacts and linear momentum | Physics | Khan Academy

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In this video, David solves an example elastic collision problem to find the final velocities using the easier/shortcut approach.
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Physics on Khan Academy: Physics is the study of the basic principles that govern the physical world around us. We'll start by looking at motion itself. Then, we'll learn about forces, momentum, energy, and other concepts in lots of different physical situations. To get the most out of physics, you'll need a solid understanding of algebra and a basic understanding of trigonometry.
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Опубликовано:

21 окт 2024

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Комментарии : 272

@shamimahmed7322 7 лет назад

Was he about to show an example of throwing a horse around its center of mass?

@TrueSpeak-TS 3 года назад

nope.

@stokes111111 10 лет назад

yo im freaking dying at homie tryna jump over the bar rn. neck broke and hes got 3 feet tho.

@itsMinuteMaid 13 лет назад

22 pound rulers and horses that look like baby elephants. Man physics is confusing

@taanisharora5577 4 года назад

did you figure it out :p

@musicaldarpan629 3 года назад

🤣😂🤣🤣😂🤣😂🤣😂😂

@heyijustmetyou9797 3 года назад

It has been 9 years dude... Are you alive?

@heyijustmetyou9797 3 года назад

@Ashton Kylan Nope, no one cares...

@taurusking2332 3 года назад

I was just saying that diagram isn’t anything close to a horse😹😹😹

@boeing747200lr 14 лет назад

Sal, you continue to amaze me!! Thank you. That high jump example was really awesome.

@AdityaGupta0130 2 года назад

What are you doing now for your job? I am seeing comment in 2022

@opiumCARTI00 11 месяцев назад

@@AdityaGupta0130probably in the field of engineering aircrafts if he really stood by that name

@guitaromania1345 11 лет назад

How does he know everything? All I know is the subject of what I'm studying right now

@KingDeramo 10 лет назад

Mythbusters are not the only ones with a team of researchers and script writers.

@8506goalie 6 лет назад

That sentence taught me two shocking things

@BreakTheBeat852 6 лет назад

I’m guessing you’re studying a lot of subjects, later on you can specialize on one specific subject of your choice, hopefully. That’s what these people do, they specialize on one subject and learn as much as they can about it

@ash.toronto31 4 года назад

Yes once you do a pHD in science you will know all this too.

@aldreivohnaquino3100 4 года назад

Uhm, Sal doesn’t just extraordinarily teach science guys, check the other playlists haha

@netadosalazar 11 лет назад

Thank you so much for doing this. I can actually understand physics now :) You do a wonderful job!

@raghidhammoud 9 месяцев назад

are you still understanding physics?

@AhmedMahmoud-qv4bw 2 года назад

hello is there any one alive here ?

@thewould2677 5 месяцев назад

I am…..

@Ansal-ln8cv7vu5r 5 месяцев назад

Yeah😂

@snowman3320 5 месяцев назад

🖐️

@user--2520 5 месяцев назад

Don't scare him , he haven't seen zombie, he would be scared to see us

@nasiiraomar5425 4 месяца назад

Nah only dead ppl

@rushilpatel7418 3 года назад

Perfectly balanced, as all things should be

@tasneemferdoustahmeed8091 2 года назад

After even 13 years this is helping!

@turcugeorge5874 8 лет назад

Everyday applications like high jumping! that made my evening

@jarikexe 8 лет назад

The picture of high jumper is awesome !!!

@AnimeTeikoku 12 лет назад

three take-aways: 1. center of mass 2. it's illegal for olympic bar jumpers to take drugs, but it's legal for them to have three feet 3. I am 7 and a half rulers heavy...

@aka3673 Год назад

Wow man 15 years at 240p

@LilTeresa101 11 лет назад

Real life applications for the win! Learn something new everyday :P

@shinobix4925 5 лет назад

Every day applications like high jumping

@aohara01 2 года назад

Beautiful horse, thank you Sal.

@1992Dadi 7 лет назад

Really cool example in the end !!!!! A nice presentation too !!!!

@yasmeenkhan8803 9 лет назад

Thanx sal khan........for the awesome explanation ........

@kaleab27 4 года назад

I really loved the last example Thanks

@moriahhamilton7436 6 лет назад

thos drawings are hysterical.....understood the concept too

@jayaich7315 5 лет назад

That's a lovely horse XD

@sakerochting 8 лет назад

Awesome, funny and logical!

@Hayattofik-o8p 16 дней назад

Did the center of mass and momentum have any relation?

@rukhsanatasneem920 10 дней назад

@blackcharizard09 13 лет назад

good job your video's are so educational that we have to watch this for homework in physics

@kadakmketema Год назад

12 yrs wow

@blackcharizard09 Год назад

@@kadakmketema i know right! Which means that’s how long it’s been since I was a senior in high school

@kadakmketema Год назад

I just wonder

@organicjuice 7 лет назад

That's not a horse.

@sheathxllinsertclan2590 4 года назад

tell em oscar

@musicaldarpan629 3 года назад

That's baby elephant 🐘😂😂😂

@bladeray1014 2 года назад

Tell em Sheathxll

@SanityFairs 10 лет назад

THE HORSE. hahaha

@musicaldarpan629 3 года назад

4:50 sir discovered a new generation of animal on earth 😂😂

@shreyasm3140 8 лет назад

You saved me!! Thanks for your amazing video

@eXtremeDR 10 лет назад

Awesome illustrations ^^ Ever heard about mass transfer with the gyroscopic effect? The center of mass can be transferred to any point - even to a point outside of the mass itself.

@Xzxzkanal 10 лет назад

How? and could this be made to a new propulsion system?

@L9X 9 лет назад

+Quantum no, sadly not, this is a common suggestion upon people who are introduced to this phenomenon, but to create propulsion from altering the centre of mass requires you continuously move the centre of mass further and further away, so if you consider a rocket in a closed system, the fumes expelled from the rocket will push the systems centre of mass away from the rocket's body. So, in a way, it already is a propulsion system utilised by rockets and aeroplanes.

@DerMacDuff 12 лет назад

DAMN AWESOME SQUARE !!!! and of course awesome videos :) thank you very much

@adwoatumtum 4 года назад

*can someone please explain further why a center of mass below the bar is beneficial? Because from the drawing, I’m assuming that if the center of mass is below the bar as the athlete is right over the bar, gravity would push the athletes body further into the bar to hit it which defeats the purpose?*

@emilyncolon8815 2 года назад

I have the same question.

@idrisShiningTimes Год назад

Doing this involves lesser change in mechanical energy (work done against gravity is less), hence lesser magnitude of force is required to jump over the bar. This saves the athlete's muscular energy and enables them to use the remaining energy for later jumps and not get tired

@johnkim96 11 лет назад

Orange Styrofoam and Green lead. Makes perfect sense! ;-)

@shivambansal99 9 лет назад

awesome video :D last example was great !

@michaelthompson7217 8 лет назад

All praise afro horse

@emirselman3984 8 лет назад

How can the center of mass be distinct from the person...?

@killmaster398 12 лет назад

Thanks man my class is building bottle rockets and I had to find out how to keep it moving straight

@dejesuscassandra6386 3 года назад

uhhhh, Can someone explain what happened at the last example? why is the center of mass below the bar?

@jnp4825 15 лет назад

you drawings are very entertaining thanks for the help :D

@musicaldarpan629 3 года назад

Hahahahahahhahahahahahahahahahahhahahaha 😂🤣🤣🤣😂🤣

@awesomemantroll1088 2 года назад

This video is so old he said "I will now do a presentation on the center of mass," and he stuttered so much! Who knew some dude drawing on a digital blackboard would get so big?

@survs21 10 лет назад

Thanks, I wish you taught me physics and calculus in varsity.

@MizzRiverP 10 лет назад

so helpful thank you!

@mahrezaitm.5162 Год назад

Thanks very much !

@HAWXLEADER 12 лет назад

Just amplifying your point...

@HAWXLEADER 12 лет назад

THOUSANDS OF GREAT VIDEOS!

@megaelliott 15 лет назад

I am sure anyone would after creating hundreds of great videos.

@anthonyrajabala 14 лет назад

Hi Sal Your Videos are excellent and amazing . God bless you.I think from F=Ma, 1 Kilogram * 9.8 m/s^2 (gravity) = 9.8 Newtons of force...so 1 kilo exerts 9.8 Newtons of force on earth. 1 Newton is approximately equal to 100 grams on earth.

@glitchy_star_classes6276 2 года назад

now, heres an amazing fact to continue your reply.. the average weight of  apple is nearly as same as that weight.. so basically 1N is the weight exerted by an average ..

@serene9532 6 лет назад

6:42 😂😂😂😂 "I don't recommend that you do"

@hannakozak3384 8 лет назад

Thank you very much! :)

@nrazdan8 11 лет назад

Before he started drawing a bar, did anyone else imagine the other type of bar and think "yessss this is the best life application example ever!"

@megaelliott 15 лет назад

If it was me, measure half way along each side between each corner and mark it. Then link each corner with its opposite facing mark with a pen or pencil and the point where the lines intersect is the center of the triangle.

@vanskis7618 7 лет назад

Styrofoam is Lighter than Lead

@BangMaster96 8 лет назад

Sir you are just great

@wildbanana5628 7 лет назад

3:22, Illuminati confirmed.

@shirleyfan5232 7 лет назад

I thought Mr. Sal knows everything, now I know maybe he is not so good at drawing horses LOL

@bluepanda2808 4 года назад

Thank you Sal...

@feb-n5g Год назад

Thanks sir, appreciate it

@marcwittkowski5146 5 лет назад

The most beautiful horse I have ever seen.

@The__Creeper 13 лет назад

"When an object is free it rotates around its center of mass" what do you mean when you say "free?" When you put a pencil on the table and flick it it does not rotate about the center of mass unless there is a fixed point at the center of mass.

@AbdulRahman-pr4vo 3 года назад

Im watching this 13 years later 😂

@debopriyapalit-me2516 5 лет назад

I have a question how to consider friction in a centre of mass???

@stokes111111 11 лет назад

excellent as always

@abhijeetas7886 4 года назад

5:42. I dont know why i even drew the horse

@jackflash8756 11 месяцев назад

You made a slight error with the eccentric force on the bar because it causes translation as well as rotation, not just rotation.

@swarnagirishbennur9159 7 лет назад

I wish u could have explained a problem or two

@seemapandey9227 Год назад

Amazing!

@luckyvinesh2272 11 лет назад

TO SAL, This is Vinesh Justin.. I am an IIT student aspiring for IIT JEE 2015. I kindly request you to plse cover all the topics of IIT JEE ADVANCE in all the chapters

@gaurav.raj.mishra 7 лет назад

It is 2017. So, did you get into IIT.

@isaacw3212 6 лет назад

the world wants to know what happened

@DigiLiterate 5 лет назад

Are you alive after doing engineering ?

@quantumsystems9382 10 лет назад

lol, 'if youre a knife catcher, which you should consider" haha

@sidgtagamer 12 лет назад

'thousands' of great videos

@sulaimanahsan6651 7 лет назад

If the force is not at centre of mass than what we can do..can we use parallel axis thrm..?

@luongmaihunggia 6 лет назад

That is a very heavy ruler.

@vovaparkourukraine1 12 лет назад

4:10 geographic center again. That's a heavy ruler btw

@DeathByLight 16 лет назад

Great explanation!

@jassubehara1924 2 года назад

Hi bro

@iamnormalandcanbetrusted 6 лет назад

Jesus Christ the dudes foot split in half

@cheesywiz9443 6 лет назад

HAHAHAHAHAHAHAHAHAHAHAHAAHAHAH xDDDD I was thinking the same xDD

@bernardodocruzeiro2496 5 лет назад

what if there is no way a force is applied to an object center of mass because its center of mass is outside the object? does that mean that there is no way for that object to be accelerated in the force's direction, leaving as the only option the rotation of the object anywhere the force is applied?

@arvindcreations2465 10 месяцев назад

i mean this is pretty late, but technically, there is a way, in fact it is must for the centre of mass to be accelerated in the force's difrection even if the COM is outside the body, lets say a ring, COM is in the centre, but still uppon application of force the acceleration is still produced in the same direction

@eieilovethis 4 года назад

This video was uploaded when I was 5. Wow

@dbmasters 13 лет назад

@BR3AK1NGbenjamin It's not their own English; it's just a variation of British English which means they are not spelling "centre" incorrectly as you originally claimed.

@jamienewman1488 2 года назад

I didn’t quite understand why having centre of mass below the bar allows for higher jumps with the same effort?

@nightmare4eVerr1 14 лет назад

awome sal! your way way way way way way bettttttterr than our lame teachers!!! i owe you my good result all thanks to you! :)

@DazHuang72 2 года назад

Super entertaining, must watch comedy education

@_xerox_8779 8 лет назад

illumenati confirmed XD but thanks that really helped me

@acleverroos 9 лет назад

+1 for horses

@rockstar-yp3jn 5 лет назад

Chup khakti.

@BewitchinGinger 12 лет назад

Hmm.... I'd say hippo with a toupee. Still super helpful though. :)

@gdogvibes1 10 лет назад

A 10 kilogram ruler?? That's 22 lbs lol!

@ThePerfect1077 7 лет назад

It's 10 kilograms lets leave it at that

@rockstar-yp3jn 5 лет назад

Lol lol mat Kar lol tera jaat.lol se tu paida hua hai lol tera baap.tu indian hai na re halkat.

@pawpawbear1175 7 лет назад

lol that was a horse?? hhahaha

@sulaimanahsan6651 7 лет назад

modern horse LOL

@rockstar-yp3jn 5 лет назад

@@sulaimanahsan6651 Chup it is mutated one.

@aeyebot 11 дней назад

Nice horse

@Wrobelkrzysztof1 11 лет назад

Thank you

@GG-uj5ru 4 года назад

The quality here is disturbing. Then I saw it was released on 2008

@dumbidot7579 4 года назад

How does one move their center of mass

@megaelliott 14 лет назад

@cCaglarOne I know! He has come so far!

@thepurplebooks 11 лет назад

Orange Styrofoam.. Excellent band-name!

@Madpolis7 13 лет назад

@batmanownsyourass The forces of friction interfere with it.

@dbmasters 13 лет назад

@BR3AK1NGbenjamin I'm not American (Being Aussie, I use British English), however you're still wrong: centre |ˈsentər| noun British spelling of center.

@q_q123 4 года назад

That's one heavy ruler

@r3boxx 12 лет назад

thats not a mistake!!! the 10N was not the weight of the object it was a force applied to cause acceleration, the magnitude of the force was a mistake. weight=100N-10N=90....90/10 = 9m/s^2 acceleration downward the direction of the motion was a mistake